3M 311 1251 Ear Plugs, Bullet, 33 dB NRR, Gen Purpose, Corded, Disposable, Roll Down, L Earplug Size, 200 PK MG 05 007 Performance Vibration Damping Cushion Material Performance Vibration Damping Cushion Material Plastic Cushion Color Black Includes Mounting Plate No Material 316 Stainless Steel Thread Size 3 8" 16 For Pipe Size (Inch) 2" For Pipe Size (Metric) 51 mm For Pipe Size 1 1 2 Height 3 3 16" Thread Length 1 3 16" Weight Capacity 1 Iron 3 NPT Female Connection Noise Reduction Rating 33 dB Earplug Color Yellow Reusability Disposable Cord Options Corded Earplug Shape Bullet Earplug Material Foam Pairs Per Package 200 Series E A Rsoft Yellow Neons Metal Detectable No Cord Material Hearing Protection Vinyl Cord Color Blue Band Material Hearing Protection Vinyl Standards 33 dB CSA Class AL Noise Reduction Rating NRR 33 dB Insertion Method Roll Down Band Color Hearing Protection Blue Earplug Pair Pack Type Plastic Bag Earplug Packaging Bulk Box Cord Material Vinyl Band Material Vinyl Electrically Insulated Yes Country of Origin United States Metal Detectable No